"use strict";
let str = 1;
str = "this is typescript 3 msg!";
// let len:number=(<string>str).length
let len = str.length;
console.log('字符串str的长度是', len);
console.log('**********************');
let a = "hello Giles";
// a=['Giles','Monica']
console.log(a.length);
console.log('*************************');
const fun23 = (x, y, z) => x + y + z;
const fun33 = (x, y, z) => x + y + z;
